One of the things I (and the pros) try to do is to try to leave myself the best shot at birdie / par that I can. That usually means leaving myself an uphill putt. I would never try to leave myself a downhill putt. But the premise is that the downhill is 1/2 the distance but on the worst slope. I'd never want that. We have some nasty slopes.
There is one course I play that has a drop of 10 feet from one tier to the next with nearly a 50% slope. They've put the hole right at the base of the slope on the lower tier. If you're on the upper tier, goodnight Irene. And visa versa. They have the hole right before the precipice.
No video, but had a really good lunch time practice session today. Keeping the right elbow in front, shoulders soft (although to be honest, this one is tough for me - I still don't know a feel for this), then the "draw path with cut pivot" idea for the downswing. Lots of mapping followed by little "chip" shots, and then a handful of full swings at the end.
I didn't vote simply because I've got conflicting choices based on distance:
1. I prefer a downhill putt for 10 feet and out. Outside of it uphill (especially twice the distance as mentioned) can actually be worse for me simply because you have to use more effort increasing stroke variance. I guess only time downhill would be bad if stimp is a stupid 11-12. I don't play on that level of courses generally.
2. Uphill for short range inside of 10 feet. The best kind of putt there is to be left with outside of a 1 foot gimme since you can power it a bit to take the break out and increase chances of outright making it.
Both for distance control in the respective ranges (obviously).